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<div id="overview"><a href="../../../../../api/org/jboss/netty/channel/AdaptiveReceiveBufferSizePredictor.html">View Javadoc</a></div><pre>

<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2009 Red Hat, Inc.</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * Red Hat licenses this file to you under the Apache License, version 2.0</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with the</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * License.  You may obtain a copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *    <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * License for the specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.channel;
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.util.List;
<a class="jxr_linenumber" name="20" href="#20">20</a>  
<a class="jxr_linenumber" name="21" href="#21">21</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="22" href="#22">22</a>  <em class="jxr_javadoccomment"> * The {@link ReceiveBufferSizePredictor} that automatically increases and</em>
<a class="jxr_linenumber" name="23" href="#23">23</a>  <em class="jxr_javadoccomment"> * decreases the predicted buffer size on feed back.</em>
<a class="jxr_linenumber" name="24" href="#24">24</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="25" href="#25">25</a>  <em class="jxr_javadoccomment"> * It gradually increases the expected number of readable bytes if the previous</em>
<a class="jxr_linenumber" name="26" href="#26">26</a>  <em class="jxr_javadoccomment"> * read fully filled the allocated buffer.  It gradually decreases the expected</em>
<a class="jxr_linenumber" name="27" href="#27">27</a>  <em class="jxr_javadoccomment"> * number of readable bytes if the read operation was not able to fill a certain</em>
<a class="jxr_linenumber" name="28" href="#28">28</a>  <em class="jxr_javadoccomment"> * amount of the allocated buffer two times consecutively.  Otherwise, it keeps</em>
<a class="jxr_linenumber" name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * returning the same prediction.</em>
<a class="jxr_linenumber" name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> * @author &lt;a href="<a href="http://www.jboss.org/netty/" target="alexandria_uri">http://www.jboss.org/netty/</a>"&gt;The Netty Project&lt;/a&gt;</em>
<a class="jxr_linenumber" name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> * @author &lt;a href="<a href="http://gleamynode.net/" target="alexandria_uri">http://gleamynode.net/</a>"&gt;Trustin Lee&lt;/a&gt;</em>
<a class="jxr_linenumber" name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $</em>
<a class="jxr_linenumber" name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="37" href="#37">37</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/jboss/netty/channel/AdaptiveReceiveBufferSizePredictor.html">AdaptiveReceiveBufferSizePredictor</a> <strong class="jxr_keyword">implements</strong>
<a class="jxr_linenumber" name="38" href="#38">38</a>          <a href="../../../../org/jboss/netty/channel/ReceiveBufferSizePredictor.html">ReceiveBufferSizePredictor</a> {
<a class="jxr_linenumber" name="39" href="#39">39</a>  
<a class="jxr_linenumber" name="40" href="#40">40</a>      <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> DEFAULT_MINIMUM = 64;
<a class="jxr_linenumber" name="41" href="#41">41</a>      <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> DEFAULT_INITIAL = 1024;
<a class="jxr_linenumber" name="42" href="#42">42</a>      <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> DEFAULT_MAXIMUM = 65536;
<a class="jxr_linenumber" name="43" href="#43">43</a>  
<a class="jxr_linenumber" name="44" href="#44">44</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> INDEX_INCREMENT = 4;
<a class="jxr_linenumber" name="45" href="#45">45</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> INDEX_DECREMENT = 1;
<a class="jxr_linenumber" name="46" href="#46">46</a>  
<a class="jxr_linenumber" name="47" href="#47">47</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong>[] SIZE_TABLE;
<a class="jxr_linenumber" name="48" href="#48">48</a>  
<a class="jxr_linenumber" name="49" href="#49">49</a>      <strong class="jxr_keyword">static</strong> {
<a class="jxr_linenumber" name="50" href="#50">50</a>          List&lt;Integer&gt; sizeTable = <strong class="jxr_keyword">new</strong> ArrayList&lt;Integer&gt;();
<a class="jxr_linenumber" name="51" href="#51">51</a>          <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 1; i &lt;= 8; i ++) {
<a class="jxr_linenumber" name="52" href="#52">52</a>              sizeTable.add(i);
<a class="jxr_linenumber" name="53" href="#53">53</a>          }
<a class="jxr_linenumber" name="54" href="#54">54</a>  
<a class="jxr_linenumber" name="55" href="#55">55</a>          <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 4; i &lt; 32; i ++) {
<a class="jxr_linenumber" name="56" href="#56">56</a>              <strong class="jxr_keyword">long</strong> v = 1L &lt;&lt; i;
<a class="jxr_linenumber" name="57" href="#57">57</a>              <strong class="jxr_keyword">long</strong> inc = v &gt;&gt;&gt; 4;
<a class="jxr_linenumber" name="58" href="#58">58</a>              v -= inc &lt;&lt; 3;
<a class="jxr_linenumber" name="59" href="#59">59</a>  
<a class="jxr_linenumber" name="60" href="#60">60</a>              <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> j = 0; j &lt; 8; j ++) {
<a class="jxr_linenumber" name="61" href="#61">61</a>                  v += inc;
<a class="jxr_linenumber" name="62" href="#62">62</a>                  <strong class="jxr_keyword">if</strong> (v &gt; Integer.MAX_VALUE) {
<a class="jxr_linenumber" name="63" href="#63">63</a>                      sizeTable.add(Integer.MAX_VALUE);
<a class="jxr_linenumber" name="64" href="#64">64</a>                  } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="65" href="#65">65</a>                      sizeTable.add((<strong class="jxr_keyword">int</strong>) v);
<a class="jxr_linenumber" name="66" href="#66">66</a>                  }
<a class="jxr_linenumber" name="67" href="#67">67</a>              }
<a class="jxr_linenumber" name="68" href="#68">68</a>          }
<a class="jxr_linenumber" name="69" href="#69">69</a>  
<a class="jxr_linenumber" name="70" href="#70">70</a>          SIZE_TABLE = <strong class="jxr_keyword">new</strong> <strong class="jxr_keyword">int</strong>[sizeTable.size()];
<a class="jxr_linenumber" name="71" href="#71">71</a>          <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; SIZE_TABLE.length; i ++) {
<a class="jxr_linenumber" name="72" href="#72">72</a>              SIZE_TABLE[i] = sizeTable.get(i);
<a class="jxr_linenumber" name="73" href="#73">73</a>          }
<a class="jxr_linenumber" name="74" href="#74">74</a>      }
<a class="jxr_linenumber" name="75" href="#75">75</a>  
<a class="jxr_linenumber" name="76" href="#76">76</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> getSizeTableIndex(<strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> size) {
<a class="jxr_linenumber" name="77" href="#77">77</a>          <strong class="jxr_keyword">if</strong> (size &lt;= 16) {
<a class="jxr_linenumber" name="78" href="#78">78</a>              <strong class="jxr_keyword">return</strong> size - 1;
<a class="jxr_linenumber" name="79" href="#79">79</a>          }
<a class="jxr_linenumber" name="80" href="#80">80</a>  
<a class="jxr_linenumber" name="81" href="#81">81</a>          <strong class="jxr_keyword">int</strong> bits = 0;
<a class="jxr_linenumber" name="82" href="#82">82</a>          <strong class="jxr_keyword">int</strong> v = size;
<a class="jxr_linenumber" name="83" href="#83">83</a>          <strong class="jxr_keyword">do</strong> {
<a class="jxr_linenumber" name="84" href="#84">84</a>              v &gt;&gt;&gt;= 1;
<a class="jxr_linenumber" name="85" href="#85">85</a>              bits ++;
<a class="jxr_linenumber" name="86" href="#86">86</a>          } <strong class="jxr_keyword">while</strong> (v != 0);
<a class="jxr_linenumber" name="87" href="#87">87</a>  
<a class="jxr_linenumber" name="88" href="#88">88</a>          <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> baseIdx = bits &lt;&lt; 3;
<a class="jxr_linenumber" name="89" href="#89">89</a>          <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> startIdx = baseIdx - 18;
<a class="jxr_linenumber" name="90" href="#90">90</a>          <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> endIdx = baseIdx - 25;
<a class="jxr_linenumber" name="91" href="#91">91</a>  
<a class="jxr_linenumber" name="92" href="#92">92</a>          <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = startIdx; i &gt;= endIdx; i --) {
<a class="jxr_linenumber" name="93" href="#93">93</a>              <strong class="jxr_keyword">if</strong> (size &gt;= SIZE_TABLE[i]) {
<a class="jxr_linenumber" name="94" href="#94">94</a>                  <strong class="jxr_keyword">return</strong> i;
<a class="jxr_linenumber" name="95" href="#95">95</a>              }
<a class="jxr_linenumber" name="96" href="#96">96</a>          }
<a class="jxr_linenumber" name="97" href="#97">97</a>  
<a class="jxr_linenumber" name="98" href="#98">98</a>          <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> Error(<span class="jxr_string">"shouldn't reach here; please file a bug report."</span>);
<a class="jxr_linenumber" name="99" href="#99">99</a>      }
<a class="jxr_linenumber" name="100" href="#100">100</a> 
<a class="jxr_linenumber" name="101" href="#101">101</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> minIndex;
<a class="jxr_linenumber" name="102" href="#102">102</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> maxIndex;
<a class="jxr_linenumber" name="103" href="#103">103</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> index;
<a class="jxr_linenumber" name="104" href="#104">104</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> nextReceiveBufferSize;
<a class="jxr_linenumber" name="105" href="#105">105</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> decreaseNow;
<a class="jxr_linenumber" name="106" href="#106">106</a> 
<a class="jxr_linenumber" name="107" href="#107">107</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment">     * Creates a new predictor with the default parameters.  With the default</em>
<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment">     * parameters, the expected buffer size starts from {@code 1024}, does not</em>
<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment">     * go down below {@code 64}, and does not go up above {@code 65536}.</em>
<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="112" href="#112">112</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/channel/AdaptiveReceiveBufferSizePredictor.html">AdaptiveReceiveBufferSizePredictor</a>() {
<a class="jxr_linenumber" name="113" href="#113">113</a>         <strong class="jxr_keyword">this</strong>(DEFAULT_MINIMUM, DEFAULT_INITIAL, DEFAULT_MAXIMUM);
<a class="jxr_linenumber" name="114" href="#114">114</a>     }
<a class="jxr_linenumber" name="115" href="#115">115</a> 
<a class="jxr_linenumber" name="116" href="#116">116</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment">     * Creates a new predictor with the specified parameters.</em>
<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="119" href="#119">119</a> <em class="jxr_javadoccomment">     * @param minimum  the inclusive lower bound of the expected buffer size</em>
<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment">     * @param initial  the initial buffer size when no feed back was received</em>
<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment">     * @param maximum  the inclusive upper bound of the expected buffer size</em>
<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="123" href="#123">123</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/channel/AdaptiveReceiveBufferSizePredictor.html">AdaptiveReceiveBufferSizePredictor</a>(<strong class="jxr_keyword">int</strong> minimum, <strong class="jxr_keyword">int</strong> initial, <strong class="jxr_keyword">int</strong> maximum) {
<a class="jxr_linenumber" name="124" href="#124">124</a>         <strong class="jxr_keyword">if</strong> (minimum &lt;= 0) {
<a class="jxr_linenumber" name="125" href="#125">125</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"minimum: "</span> + minimum);
<a class="jxr_linenumber" name="126" href="#126">126</a>         }
<a class="jxr_linenumber" name="127" href="#127">127</a>         <strong class="jxr_keyword">if</strong> (initial &lt; minimum) {
<a class="jxr_linenumber" name="128" href="#128">128</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"initial: "</span> + initial);
<a class="jxr_linenumber" name="129" href="#129">129</a>         }
<a class="jxr_linenumber" name="130" href="#130">130</a>         <strong class="jxr_keyword">if</strong> (maximum &lt; initial) {
<a class="jxr_linenumber" name="131" href="#131">131</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"maximum: "</span> + maximum);
<a class="jxr_linenumber" name="132" href="#132">132</a>         }
<a class="jxr_linenumber" name="133" href="#133">133</a> 
<a class="jxr_linenumber" name="134" href="#134">134</a>         <strong class="jxr_keyword">int</strong> minIndex = getSizeTableIndex(minimum);
<a class="jxr_linenumber" name="135" href="#135">135</a>         <strong class="jxr_keyword">if</strong> (SIZE_TABLE[minIndex] &lt; minimum) {
<a class="jxr_linenumber" name="136" href="#136">136</a>             <strong class="jxr_keyword">this</strong>.minIndex = minIndex + 1;
<a class="jxr_linenumber" name="137" href="#137">137</a>         } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="138" href="#138">138</a>             <strong class="jxr_keyword">this</strong>.minIndex = minIndex;
<a class="jxr_linenumber" name="139" href="#139">139</a>         }
<a class="jxr_linenumber" name="140" href="#140">140</a> 
<a class="jxr_linenumber" name="141" href="#141">141</a>         <strong class="jxr_keyword">int</strong> maxIndex = getSizeTableIndex(maximum);
<a class="jxr_linenumber" name="142" href="#142">142</a>         <strong class="jxr_keyword">if</strong> (SIZE_TABLE[maxIndex] &gt; maximum) {
<a class="jxr_linenumber" name="143" href="#143">143</a>             <strong class="jxr_keyword">this</strong>.maxIndex = maxIndex - 1;
<a class="jxr_linenumber" name="144" href="#144">144</a>         } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="145" href="#145">145</a>             <strong class="jxr_keyword">this</strong>.maxIndex = maxIndex;
<a class="jxr_linenumber" name="146" href="#146">146</a>         }
<a class="jxr_linenumber" name="147" href="#147">147</a> 
<a class="jxr_linenumber" name="148" href="#148">148</a>         index = getSizeTableIndex(initial);
<a class="jxr_linenumber" name="149" href="#149">149</a>         nextReceiveBufferSize = SIZE_TABLE[index];
<a class="jxr_linenumber" name="150" href="#150">150</a>     }
<a class="jxr_linenumber" name="151" href="#151">151</a> 
<a class="jxr_linenumber" name="152" href="#152">152</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> nextReceiveBufferSize() {
<a class="jxr_linenumber" name="153" href="#153">153</a>         <strong class="jxr_keyword">return</strong> nextReceiveBufferSize;
<a class="jxr_linenumber" name="154" href="#154">154</a>     }
<a class="jxr_linenumber" name="155" href="#155">155</a> 
<a class="jxr_linenumber" name="156" href="#156">156</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> previousReceiveBufferSize(<strong class="jxr_keyword">int</strong> previousReceiveBufferSize) {
<a class="jxr_linenumber" name="157" href="#157">157</a>         <strong class="jxr_keyword">if</strong> (previousReceiveBufferSize &lt;= SIZE_TABLE[Math.max(0, index - INDEX_DECREMENT - 1)]) {
<a class="jxr_linenumber" name="158" href="#158">158</a>             <strong class="jxr_keyword">if</strong> (decreaseNow) {
<a class="jxr_linenumber" name="159" href="#159">159</a>                 index = Math.max(index - INDEX_DECREMENT, minIndex);
<a class="jxr_linenumber" name="160" href="#160">160</a>                 nextReceiveBufferSize = SIZE_TABLE[index];
<a class="jxr_linenumber" name="161" href="#161">161</a>                 decreaseNow = false;
<a class="jxr_linenumber" name="162" href="#162">162</a>             } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="163" href="#163">163</a>                 decreaseNow = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="164" href="#164">164</a>             }
<a class="jxr_linenumber" name="165" href="#165">165</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (previousReceiveBufferSize &gt;= nextReceiveBufferSize) {
<a class="jxr_linenumber" name="166" href="#166">166</a>             index = Math.min(index + INDEX_INCREMENT, maxIndex);
<a class="jxr_linenumber" name="167" href="#167">167</a>             nextReceiveBufferSize = SIZE_TABLE[index];
<a class="jxr_linenumber" name="168" href="#168">168</a>             decreaseNow = false;
<a class="jxr_linenumber" name="169" href="#169">169</a>         }
<a class="jxr_linenumber" name="170" href="#170">170</a>     }
<a class="jxr_linenumber" name="171" href="#171">171</a> }
</pre>
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